Incident Library
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  1. IL-0465 IONOS Container Registry image pushes and pulls failed with 504 Gateway Timeout
    IONOS Cloud2026
    Symptoms

    On 4 March 2026 customers of the IONOS Container Registry got 504 Gateway Timeout errors when pushing or pulling container images, and deployments that relied on the registry were blocked. The status page first reported an increased error count on the registry at 09:23 UTC, saying customers might be unable to pull images.

    Image pull failuresHigh error rate
    Trigger

    A migration combined with a temporary capacity constraint placed two critical control plane components on the same proxy instance, despite anti-affinity rules; the shared proxy then reached its concurrent connection limit.

    Root cause
    Capacity exhaustion
    Component
    Container registry and its credentialsManaged Kubernetes control plane and provider APIPod scheduling and placement
    Contributing factor
    No headroomSingle point of failureNo alert on limit
    Remediation
    • Rolled back a component of the Kubernetes control plane to an earlier version
    • Provisioned additional proxy capacity
    • Moved the affected control plane components onto separate proxy instances
    Action items
    • Redesign registry-to-API connectivity so each node uses its own local proxy
    • Adjust alert thresholds to warn before proxy connection use approaches capacity
    • Deploy more infrastructure clusters and redistribute registries so no cluster exceeds safe capacity, with automation that keeps balancing load
    View case
Check your cluster for this

This case involves Managed Kubernetes control plane and provider API and Pod scheduling and placement. kubegap audits a Kubernetes cluster for gaps like these, read-only, from Claude Code or Codex; its checks cite public reports like the ones in this library.

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By root cause1

Capacity exhaustion1 case

Component
Managed Kubernetes control plane and provider APIPod scheduling and placementContainer registry and its credentials
Contributing factor
No alert on limitNo headroomSingle point of failure
Organisation
IONOS Cloud
  1. IL-0465 IONOS Container Registry image pushes and pulls failed with 504 Gateway Timeout
    IONOS Cloud2026